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Preface Part I. Puzzles: 1. A natural curiosity: how did language begin? 2. A peculiar habit: what is language for? 3. The bother at Babel: why do languages differ so much? 4. Distinct duties: is language an independent skill? Part II. Origin: 5. The family tree: the evolutionary background 6. A devious mind: the basic requirements 7. Broken air: inherited ingredients 8. Small beginnings: first steps Part III. Evolution: 9. The secong word: the emergence of rules 10. The tower of speech: expansion 11. Time travelling: extra attachments 12. Rebuilding on the high seas: keeping going Part IV. Diffusion: 13. The widening circle: moving outwards 14. The hidden core: the hunt for universals 15. The real magician: ruling the rules 16. Unweaving the rainbow: separating the strands 17. The endless stair: past and future Symbols used in the text Notes and suggestions for further reading References Index.
A Sat, study studied this question.